How to reproduce:
1. Create and open a new project
2. Enable the ‘Use new Hierarchy window' option in 'Edit -> Preferences -> General’ window
3. Create any GameObject in the new Hierarchy
4. Select the GameObject
5. In the Inspector, press the hamburger icon (three-dot menu), then select the "Ping" option
6. Observe the Hierarchy

Actual result: Nothing is pinged and highlighted in yellow
Expected result: The selected GameObject is pinged and highlighted in yellow (at least in dark mode)

Reproducible in: 6000.3.1f1, 6000.4.0a1, 6000.4.0b1, 6000.5.0a3
Not reproducible in: 6000.3.0a6
Could not test in: 6000.0.64f1 (New Hierarchy window is not featured yet)

Reproduced on: Windows 11 Pro (25H2)
Not reproduced on: No other environment tested

Notes:
- Piniging works fine in the old Hierarchy window
- In 6000.4.0a1 and later, the select GameObject loses the blue highlight if it is pinged. And until 6000.4.0a3 (including), the highlight is lost gradually. In later versions, the selection snaps off immediately
- Pinging through code never worked correctly. Until 6000.4.0a1, the GameObject would be pinged once the selected GameObject lost its selection (if no other GameObject was selected after pinging). And after 6000.4.0a1, the selected GameObject is never pinged